Geometry-free undifferenced, single and double differenced analysis of single frequency GPS, EGNOS and GIOVE-A/B measurements

Bakker, Peter F. de; Marel, H. van der; Tiberius, C.C.J.M.

doi:10.1007/s10291-009-0123-6

Cited by 52 publications

(34 citation statements)

References 4 publications

(4 reference statements)

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“…The method has been introduced in De Bakker et al (2009), Van der Marel et al (2009), and. Table 1 summarizes the single-frequency linear combinations for the code and carrier measurements.…”

Section: Methodsmentioning

confidence: 99%

“…All computations are performed with respect to a reference C/N 0 of 45 dB-Hz. A method to estimate the standard deviation of each of the linear combinations for C/N 0 = 45 dB-Hz from the measurements is described in De Bakker et al (2009).…”

Section: Methodsmentioning

confidence: 99%

“…A versatile short and zero baseline analysis method was introduced in De Bakker et al (2009) which uses a geometryfree model and different linear combinations of GNSS measurements to separate the contributions of different error sources to the measurement error at the receiver. The method was applied to measurements collected with two single-frequency Septentrio AsteRx1 receivers tracking satellites from GPS, EGNOS, and GIOVE on the L1/E1 frequency.…”

Section: Introductionmentioning

confidence: 99%

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Short and zero baseline analysis of GPS L1 C/A, L5Q, GIOVE E1B, and E5aQ signals

et al. 2011

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Stochastic properties of GNSS range measurements can accurately be estimated using a geometry-free short and zero baseline analysis method. This method is now applied to dual-frequency measurements from a new field campaign. Results are presented for the new GPS L5Q and GIOVE E5aQ wideband signals, in addition to the GPS L1 C/A and GIOVE E1B signals. As expected, the results clearly show the high precision of the new signals, but they also show, rather unexpectedly, significant, slowly changing variations in the pseudorange code measurements that are probably a result of strong multipath interference on the data. Carrier phase measurement noise is assessed on both frequencies, and finally successful mixed GPS-GIOVE double difference ambiguity resolution is demonstrated.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Short and zero baseline analysis of GPS L1 C/A, L5Q, GIOVE E1B, and E5aQ signals

et al. 2011

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“…For example, the polynomial variations induced by the satellite motion could have been predicted from the satellite and user velocities and positions, and these variations could then have been removed from the pseudorange rate measurements. Similarly, fitting of low order polynomials can be used as suggested by de Bakker et al (2009).…”

Section: Pseudorange Rate Pre-filteringmentioning

confidence: 99%

Identifying a low-frequency oscillation in Galileo IOV pseudorange rates

2015

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Galileo, the European global navigation satellite system, is in its in-orbit validation phase and the four satellites which have been available for some months now have allowed a preliminary analysis of the system performance. Previous studies have showed that Galileo will be able to provide pseudorange measurements more accurate than those provided by GPS. However, a similar improvement was not found for pseudorange rate observations in the velocity domain. This fact stimulated additional analysis of the velocity domain, and, in particular, an unintended oscillatory component was identified as the main error source in the velocity solution. The magnitude of such oscillation is less than 10 cm/s, and its period is in the order of few minutes. A methodology was developed to identify oscillatory components in the Galileo IOV pseudorange rate observables, and it was verified that the measurements from Galileo IOV PFM and Galileo IOV FM2 are affected by a small oscillatory disturbance. This disturbance stems from the architecture adopted for combining the frequency references provided by the two active clocks present in the Galileo satellites. The issue has been solved in Galileo IOV FM3 and Galileo IOV FM4, and the oscillatory component has been eliminated. We also propose a methodology for removing this unwanted component from the final velocity solution and for determining the performance that Galileo will be able to achieve. The analysis shows that Galileo velocity solution will provide a root-mean-square error of about 8 cm/s even in the limited geometry conditions achieved using only four satellites. This shows the potential of Galileo also in the determination of user velocity.

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“…This includes the signal analysis and positioning performance. The former studies of Galileo signals were devoted to phase and code noise, multipath, and cross-correlation [9][10][11][12][13]. The latter issue, applied to both single-system and multi-constellation single-point positioning, was investigated in [14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

On the Applicability of Galileo FOC Satellites with Incorrect Highly Eccentric Orbits: An Evaluation of Instantaneous Medium-Range Positioning

2018

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This study addresses the potential contribution of the first pair of Galileo FOC satellites sent into incorrect highly eccentric orbits for geodetic and surveying applications. We began with an analysis of the carrier to noise density ratio and the stochastic properties of GNSS measurements. The investigations revealed that the signal power of E14 & E18 satellites is higher than for regular Galileo satellites, what is related to their lower altitude over the experiment area. With regard to the noise of the observables, there are no significant differences between all Galileo satellites. Furthermore, the study confirmed that the precision of Galileo data is higher than that of GPS, especially in the case of code measurements. Next analysis considered selected domains of precise instantaneous medium-range positioning: ambiguity resolution and coordinate accuracy as well as observable residuals. On the basis of test solutions, with and without E14 & E18 data, we found that these satellites did not noticeably influence the ambiguity resolution process. The discrepancy in ambiguity success rate between test solutions did not exceed 2%. The differences between standard deviations of the fixed coordinates did not exceed 1 mm for horizontal components. The standard deviation of the L1/E1 phase residuals, corresponding to regular GPS and Galileo, and E14 & E18 satellite signals, was at a comparable level, in the range of 6.5-8.7 mm. The study revealed that the Galileo satellites with incorrect orbits were fully usable in most geodetic, surveying and many other post-processed applications and may be beneficial especially for positioning during obstructed visibility of satellites. This claim holds true when providing precise ephemeris of satellites.

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Geometry-free undifferenced, single and double differenced analysis of single frequency GPS, EGNOS and GIOVE-A/B measurements

Cited by 52 publications

References 4 publications

Short and zero baseline analysis of GPS L1 C/A, L5Q, GIOVE E1B, and E5aQ signals

Short and zero baseline analysis of GPS L1 C/A, L5Q, GIOVE E1B, and E5aQ signals

Identifying a low-frequency oscillation in Galileo IOV pseudorange rates

On the Applicability of Galileo FOC Satellites with Incorrect Highly Eccentric Orbits: An Evaluation of Instantaneous Medium-Range Positioning

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